helm chart always not going into the if condition - kubernetes

Question

yaml file and in that below values are defined including one specific value called "environment"
image:
repository: my_repo_url
tag: my_tag
pullPolicy: IfNotPresent
releaseName: cron_script
schedule: "0 10 * * *"
namespace: deploy_cron
rav_admin_password: asdf
environment: testing
testing_forwarder_ip: 10.2.71.21
prod_us_forwarder_ip: 10.2.71.15
Now in my helm chart based on this environment value i need to assign a value to new variable and for that I have written code like below, but always it is not entering into the if else block itself
{{- $fwip := .Values.prod_us_forwarder_ip }}
{{- if contains .Values.environment "testing" }}
{{- $fwip := .Values.testing_forwarder_ip }}
{{- end }}
---
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: "{{ .Values.releaseName }}"
namespace: "{{ .Values.namespace }}"
labels:
....................................
....................................
....................................
spec:
restartPolicy: Never
containers:
- name: "{{ .Values.releaseName }}"
image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
imagePullPolicy: IfNotPresent
args:
- python3
- test.py
- --data
- 100
- {{ $fwip }}
In the above code always i get $fwip value as 10.2.71.21 what ever environment value is either testing or production for both i am getting same value
And if i don't declare the variable $fwip before the if else statement then it says $fwip variable is not defined error, So i am not sure why exactly if else statement is not getting used at all, How to debug further ?

Answer 1

This is a syntax problem of variables and local variables.
The fwip in if should use = instead of :=
{{- $fwip := .Values.prod_us_forwarder_ip }}
{{- if contains .Values.environment "testing" }}
{{- $fwip = .Values.testing_forwarder_ip }}
{{- end }}
I translated it into go code to make it easier for you to understand.
(In the go language, := means definition and assignment, = means assignment)
// :=
env := "testing"
test := "10.2.71.21"
prod := "10.2.71.15"
fwip := prod
if strings.Contains(env,"testing"){
fwip := test
fmt.Println(fwip) // 10.2.71.21
}
fmt.Println(fwip) // 10.2.71.15
// =
env := "testing"
test := "10.2.71.21"
prod := "10.2.71.15"
fwip := prod
if strings.Contains(env,"testing"){
fwip = test
fmt.Println(fwip) // 10.2.71.21
}
fmt.Println(fwip) // 10.2.71.21